CSV to JSON Converter
Drop a CSV file below and get JSON back in seconds — converted on your own device, not uploaded anywhere.
Processed entirely in your browser using a Web Worker. Nothing is uploaded.
What is CSV?
CSV (Comma-Separated Values) is a plain-text table format — one line per row, fields separated by commas. It's the closest thing to a universal format for spreadsheets and simple databases: nearly every spreadsheet app, database and programming language can read it, but it can only represent flat tables, not nested structures.
What is JSON?
JSON (JavaScript Object Notation) is a plain-text format for structured data — objects, arrays, strings, numbers, booleans and null, nested as deeply as needed. It's the standard format for web APIs and configuration files, and every modern programming language can parse it natively.
How it works
- Drop your CSV file into the box above, or click to choose one.
- Your browser parses it and rewrites it as JSON instantly — nothing is sent anywhere.
- Download the JSON file. That's it.
Other conversions
JSON to CSV
opening API output or a config file in a spreadsheet
JSON to YAML
turning API output or a data export into a more human-editable config file
YAML to JSON
feeding a YAML config file into a tool or script that only reads JSON
CSV to YAML
turning a spreadsheet export into a human-editable YAML config file
YAML to CSV
opening a YAML config file's data in a spreadsheet
Questions.
Is my file uploaded to a server?
No. The conversion runs entirely in your browser — your CSV file never leaves your device.
Does anything get lost converting to JSON?
No — every value in the CSV is preserved. Each row becomes one JSON object, with the header row supplying each field's key; empty cells become empty strings.
Is there a file size limit?
No limit is enforced by the tool itself — the practical ceiling is your browser's available memory, which handles typical data files easily.
Is this really free?
Yes — every format conversion on ByteRivet is free, with no account or daily limit.
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